Improvement in head-blocks for saw-mills



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Head-Blocks for Saw-Mills. No. 133,995. ff Patented 1366.17, 1872.

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Head-Blocks for Saw-Mils.

No. 133,995. Patented Dec.17,1s72.

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UNITED STATES CHARLES LEDDEL, 0E MoRRisTowN, NEW JERSEY.

IMPROVEMENT IN HEAD-BLOCKS FOR SAW-MILLS.

Specification forming part of Letters Patent N0..133,995, dated December 17, 1872.

.To all whom it may concern:

YBe it known that I, CHARLES LEDDEL, of Morristown, in the county of Morris and State of New Jersey, have invented a new and use- Y ful Improvement in Head-Blocks for Saw-Mills,

of which the following is a specification:

In my improved log-setting apparatus there is a long toothed rack on the back side of the log-beam parallel with it and movable in the direction of its length which gears at each headblock with a pinion on a shaft having a pinion gearing with a toothed rack on the head-block, so that by the movement of the said long toothed rack the log-beam will be moved for- -ward or back alike on all the head-blocks, and the pinion-shaft at the head of the carriage f rises as high or higher than the height of the ,largest logs, and has a ratchet-wheel on its upper end, with which wheel is a pawl-lever, double-acting pawl, a push-and-pull bar for actuating the lever from the sawyers position ein front of the saw, and a holding-pawl to prevent the back pressure of the log from y turning the ratchet-wheel, all being arranged so that the aforesaid wheel may be worked by the sawyer in the aforesaid position to set the 'log and shift thelog-beam back for a new log. The invention also comprises a knee for settin g out the log to saw tapering stuff, Worked by a hand-Wheel, pinion7 and rack, independent of the aforesaid apparatus, which is for setting the 10g to besawed intoV stuff` with parallel The invention also comprises a novel arrangement of a scale and movable pointer to show the distance of the dogs from the saw and guide the operator in setting the log.

Figure 1 is a plan view of a log-carriage v f with my improved log-setting apparatus; Fig.

2 is a side elevation; Fig. 3 is a cross-section on the line x x of Fig. 2; and Fig. 4. is a side elevation of the ratchet-Wheel and pawl-lever; Fig. 5 is a plan view, showing a modified arrangement of the pawls and ratchet-wheel, also the application of the scale; and Fig. 6 is a front elevation of Fig. 5.

Similar letters of reference indicate corresponding parts.

A represents the head-blocks, and B the log- .,beam of the carriage. Said log-beam is to be Y provided with the usual knees at. D and the kdogs for holding the log, and it slides forward and back on the headblocks, being provided rack is actuated by pinion H and turns the,

pinions H and E the same as said pinion H is turned, and this latter isv turned by the ratchet-wheel I on the top`of the long vertical shaft K, which is turned by the pawllever L, pawls M, and rod N, the latter extending from the free end of the Sawyer-lever to the front of the saw. O is a weighted pawl, which engages with the under-side rim P of ratchet-teeth of wheel I to prevent it from being turned backward by the pressure of the log on the log-beam, which is sometimes very great, particularly when a presser-rolleris used on the opposite side of the log to prevent it' from springing. The weighted pawl is lifted out of the said ratchet-teeth when the log-beam is to be moved back by lifting the handle Q upon a pin to the left or right. The weight keeps said pawl in connection with the ratchet-wheel when the pawl is shifted olf the pin. I prefer to have the pawls pivoted to the block j, which may, at its pointed end, be shifted to either side of the springstud q for shifting one pawl into gear and the other out. The shaft K- is supported at the upper end on the bearing R supported on the tops lof the posts, and above this bearing R is a' plate, T, for the pawl-lever to Work on. Above the pinion H' said shaft is arranged in a bearing-plate, U, which is bolted to plate V so as to be shifted out or in to bring the pitch-line of pinion H and that of the rack G to coincide. The lower bearin g Wis made to correspond with bearing U. The shafts of pinion H are supported in like manner by plates V and bearings W. The

racks are provided with flanges aand the pin-v ions with knees or shoulders b corresponding to the pitch-lines, which are caused to bear against each other and prevent the teeth from sinking too deep. They also facilitate the setting of the pinion with the racks. For setting the log out to saw tapering stud Ihave a knee, d, on one of the head-blocks independent of the rack G, and arranged to slide back and forth on the log-beam, as shown at e, and provided with a hand-wheel, f, pinion g, and rack h for moving it in or out. '.lhis knee is secured after being adjusted by the set-screw j acting upon the hand-Wheel, as shown. mis a scale, supported above the log-beam by posts V', and p is a pointer, xed to slide along it and connected to the cord r, Working over .pulleys fv, and connected to opposite sides of the carriage, as shown, so that the moving of the log-beam causes the pointer to move along the scale the same amount that said lo g-beam and the knees attached to it do. This scale fronts the sawyer, so that it is more convenient for him to note its indications than when otherwise arranged.

I propose to have the posts V made of gastube, and have the cord r pass up and down in them to be protected. The said tube will have brackets w, as shown, at the upper ends to support the pulleys t and the scale-beam.

tially as specified.

CHARLES LEDDEL.

Witnesses:

Tiros. HUGHES, AUG. C. CANFIELD. 

